A shift control system for a hybrid vehicle having an engine and a motor as power sources may include a driving condition detector which detects whether a kick-down shift-request occurs in EV (Electric Vehicle), and a hybrid control unit which changes a driving mode from the EV (Electric Vehicle) mode to HEV (Hybrid Electric Vehicle) mode by connecting an engine clutch when the kick-down shift-request may be detected and an engine may be operated, and executes a kick-down shift.